I actually listened and tried to pick one out, the only thing I found remotely similar is the 1st couple seconds of the chorus of Symphony Of Destruction with the intro of witches dance.. but it wasn't much..

Its the descending guitar part in the very beginning of witch's dance with the guitar part in the 1st half of the chorus. "Just like the pied piper..." but thats it. I see it now, but I wouldn't say they're very similar.

There are spots like that in lots of songs by lots of artists. Sometimes the first part of the Mercyful Fate song Insanity sounds like the first part of the Gwar song Licksore to me.

The beginning part of the solo background music on the Jonah sounds similiar to a part of Iron Maiden's Waster Years to me. I believe Fatal Portrait and Somewhere in Time were released the same year or a year apart(??)...